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Implement preliminary version of "reverse" feature

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Not hooked to all RGBGFX flags yet, but good enough for most use cases
(and as a base for future development, should I need to `reset --hard`.)

TODOs marked appropriately.
This commit is contained in:
ISSOtm
2022-03-27 20:21:00 +02:00
committed by Eldred Habert
parent 843022772b
commit cc27169ecd
9 changed files with 428 additions and 18 deletions
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13
include/gfx/main.hpp
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@@ -20,6 +20,9 @@
#include "gfx/rgba.hpp"
struct Options {
uint8_t reversedWidth = 0; // -r, in pixels
bool reverse() const { return reversedWidth != 0; }
bool useColorCurve = false; // -C
bool fixInput = false; // -f
bool allowMirroring = false; // -m
@@ -36,7 +39,7 @@ struct Options {
} palSpecType = NO_SPEC; // -c
std::vector<std::array<Rgba, 4>> palSpec{};
uint8_t bitDepth = 2; // -d
std::array<uint32_t, 4> inputSlice{0, 0, 0, 0}; // -L
std::array<uint32_t, 4> inputSlice{0, 0, 0, 0}; // -L (margins in clockwise order, like CSS)
std::array<uint16_t, 2> maxNbTiles{UINT16_MAX, 0}; // -N
uint8_t nbPalettes = 8; // -n
std::string output{}; // -o
@@ -84,4 +87,12 @@ struct Palette {
uint8_t size() const;
};
static constexpr uint8_t flip(uint8_t byte) {
// To flip all the bits, we'll flip both nibbles, then each nibble half, etc.
byte = (byte & 0b0000'1111) << 4 | (byte & 0b1111'0000) >> 4;
byte = (byte & 0b0011'0011) << 2 | (byte & 0b1100'1100) >> 2;
byte = (byte & 0b0101'0101) << 1 | (byte & 0b1010'1010) >> 1;
return byte;
}
#endif /* RGBDS_GFX_MAIN_HPP */

14
include/gfx/reverse.hpp Normal file
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@@ -0,0 +1,14 @@
/*
* This file is part of RGBDS.
*
* Copyright (c) 2022, Eldred Habert and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
#ifndef RGBDS_GFX_REVERSE_HPP
#define RGBDS_GFX_REVERSE_HPP
void reverse();
#endif /* RGBDS_GFX_REVERSE_HPP */

14
include/gfx/rgba.hpp
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@@ -17,13 +17,23 @@ struct Rgba {
uint8_t blue;
uint8_t alpha;
Rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a) : red(r), green(g), blue(b), alpha(a) {}
constexpr Rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
: red(r), green(g), blue(b), alpha(a) {}
/**
* Constructs the color from a "packed" RGBA representation (0xRRGGBBAA)
*/
explicit Rgba(uint32_t rgba = 0)
explicit constexpr Rgba(uint32_t rgba = 0)
: red(rgba >> 24), green(rgba >> 16), blue(rgba >> 8), alpha(rgba) {}
static constexpr Rgba fromCGBColor(uint16_t cgbColor) {
constexpr auto _5to8 = [](uint8_t fiveBpp) -> uint8_t {
fiveBpp &= 0b11111; // For caller's convenience
return fiveBpp << 3 | fiveBpp >> 2;
};
return {_5to8(cgbColor), _5to8(cgbColor >> 5), _5to8(cgbColor >> 10),
(uint8_t)(cgbColor & 0x8000 ? 0x00 : 0xFF)};
}
/**
* Returns this RGBA as a 32-bit number that can be printed in hex (`%08x`) to yield its CSS
* representation